Any hints for getting the actual plastic bulb housing out? I can turn it (towards the outside) about 45 degrees but it won't budge or loosen to remove it outwards. I even cracked one of the twist holds trying to turn it further. Is there a clip or something on some models?

After twisting the bulb base counterclockwise to unlock it, it can take a good bit of effort to pull out sometimes. Make sure you're pulling perpendicular to the bulb base, not straight back (i.e. not perpendicular to the ground) because I think the the base is on a slight incline. If you still can't pull it out after turning the base as far as you can counterclockwise, twist it clockwise just a smidgen and try removing it again.

Installed mine a few days ago, the 23 led amber version, no need for sanding, just a bit of muscle strength to twist it on and off a few time. Noticed the flickering on start up and coded that off. Very happy with the outcome. Thank you to Madders and Chrisk for the clarification and videos!!